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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8249900626eb36e51038ff4a14c10b8238a5c1d3acca019a40ea27f0e7313b3' 
  AND token = '4a126kAbpu95KVRz3xj/Zh/vTKGraimp6h/t0S0QniE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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