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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f226ff6a1e46b862ae2e6c5149fa4a176f0b6156fbf0a9d622d90583c0c474f5' 
  AND token = 'OXGjb21AjLyS3LYb+D/jZgkAVLPdizAH6KE3spIlQfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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