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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae7003434f8aaa64453105c322e15e2333246346f432086ed1444d76919798b2' 
  AND token = '0G1dY2xRXfOEyFtOQ4zsanE4sC4olmPcC2qFobmm0jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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