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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44300a84e08687f5cb39089f391061b57eaf3b505360bf4441d8384e74e1bf63' 
  AND token = 'erNDjobFQFIwevMASG3zOUbp2j08l1BWWOmWeaMB/zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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