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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58827711335d369d0344c85c6716c64b0086c72a7f3298235a25ff5d7f82f432' 
  AND token = '1aop9AqlTt/hFUo1IKh5g1mP2WcNVDP1nXK3veHGP2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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