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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2831d964fbbd86e01d81286aca7ca6bf3d4e578fc6b6d6ea5754e64d8d3bf81b' 
  AND token = 'OYaXNh9UFB7lsY8NtPNcO+i3kdbEZEODXvyWURdDT80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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