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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d64f0edf2e6729649e9fbc5ac5fb32143cfa9f960da6b196c532d5bacd21317' 
  AND token = 'VNTcC8Cv7Fh4CDX4X+Ib1u/+r+o+V/1XOEe1QC77jRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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