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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87f241dcd49e262b7166afb89c3ac5e3d76f93e22d9126dcaa71a87b0bcf207' 
  AND token = 'pFgdJEaKaBVqFtB03BpriAH8iGz/5+QVqfVVdqF/I9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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