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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eecbf34201efec620595a0e99e63727286b1b114890fe5fd6477cc4b9b5078f' 
  AND token = 'YCPKiSj6j35noG9bY0IbxDBaHaA69jcUCKx8aZeqv6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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