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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97446cbb9e5026511d3fd8cd5fdc204cd01046d9eb20e2ecd88067bcec0b4f1c' 
  AND token = 'qxD+LKdLUZfvDJ6sn9iZc8RAdoJeuWdGfGKdpkgKHmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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