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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3775cd5e08a54db838ec5d32cc1ae8c4617bd089f02ba80da56dca4279e9e8f' 
  AND token = 'jCUf510fp3XzGGJVCpvMWz/o6s73bc+0xAsH6qCXSys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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