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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74eac514a9cb3615d77b38957ee9f8aa46943c484eba6336af9e7da93950a61' 
  AND token = 'URLd+9tq1CiWKMsuoVMBuG0Jk60ahmgIjLUYEDCUEb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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