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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8cc31607190e74ca507de4f29f499a86239e2da7a1c09c94c5bffb613c1cda1' 
  AND token = 'iXuz/7FpMaji6EvYtouV2nZzmsLO9jrJ/0M2+e9T5NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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