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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1a807e151c2652bfa4637f8141dd5f314f46ad993048ca8f299ed779243b70' 
  AND token = 'PqlHDGi5O7uacQZ4po782GoswcbAMJY77wkD2ka2KZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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