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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a39b6840f59655d88ae2ddc50c2abc4937699ca94d18b97732e71c124974b5' 
  AND token = 'KVynKa89IU14j87VD7Cs3AUaAdXaHGydrQW8NDSs04M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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