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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f39775e899e952e64f9e3f3014db444ae731934613f9864201ea67f2c37926e' 
  AND token = 'IYCXq4k/dC3j72kRyHmMqldbNwykHygTYpT2wKVAU2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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