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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96cc9e6352783b24d412d61e7749380d6891302c1843ede8edde3dbd5b371d00' 
  AND token = '40H9k4DdcWIMd+3zBQ8My+Tb94vJSwfgfZ2pr8xKJ2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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