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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b17d013b7a62949c7f5850ec0957d1409a5de502c494f5cd54998da8d7c039' 
  AND token = 'LH4DKf2IqspQfKESkZSBV9GKBjTdEo5NMSTPasKcF14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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