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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43644711e7133d808fe3a4f349fa141c2c10c178c97b19c88fd4395c04b7b97e' 
  AND token = 'kSzeV7b35R7L9gy94TJUN84jCGheq6ZWsP2ijjVf/MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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