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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2bb71faa7089c9751350297ec9e2dd54db6c81e65940e04de8474ecfa13293a' 
  AND token = '+tuK7njX/cgUyqrjAdNhsoGiBCWYNtegkFUf9jYXQkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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