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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a97fdb9b78c449704ae90fdae9a2ccdca0b0043d1e6a06448d594096b11f178' 
  AND token = '2hP3OIJLIv+eLfPK4DVZDPR9HiXAJhaoZMpEC5WWfqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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