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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb4c8b1dfe0fc621691eece119c6624c3605bd105963cce3f62c7f539bbcafe' 
  AND token = 'CW0jkV71jFDNyqCJkipv/c6QfBHxR7SjiXEtNaC1p6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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