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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '315c0f44faf7f9804d43f806af30655fd03f989a2a5f077e316f84f8199fd8d0' 
  AND token = '9uqwdWiRbuy4tjUEt1ZcNtFJ0L7puNDVQtO1InDwLHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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