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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c6900ad8734bae35f6a12660f58a94356baff2c10902c62ffc42e6e0ab0d64c' 
  AND token = 'Z7zF1V+16JbOEL6rzyZr/0auA78ri9tsFk3LUfKD0sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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