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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '814f44f46438d8540fe16e9a1c1524dcfbb05a2312b7f90fa12f6ecb8888c9cf' 
  AND token = 'JeQwEY8EsJREkaUkdBgaciDEpIenNPX1QM3eTWANPO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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