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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1ec1aa1c3d3cddc20312b95eb2d636572d127a26151a40691dd70da739e332' 
  AND token = 'aU+cYjzgdLCBuGr6hdsmzsqfAt99mgm986Ah8r8u1bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00125

JSON explain

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