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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c38f795e570fe9a328e6610711fae390d0e17ce4041dd28a9790b3dcd17c1842' 
  AND token = 'lcW/Rqcj11yvA6uFlOr1u3KUvQHv3DbUctidiY0Ouck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00110

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}