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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c6272ae83b4e9fca3501557f0dd79fa889c52c5df2018ee830d960030ce2bd7' 
  AND token = 'eA4BgLzXAoXi5Z3x6r+tutHmNmkvnEO5sa+ASPjEdkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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