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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e1df0b5f1bd321f28c164c600f2131f6f0eba8bad3ad79a119744bcbd10c44' 
  AND token = 'kH/Tzjcwys4lI4FwsDClFCIz2lr+XZPSuy3yYSexHco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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