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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '211fdf286dd4c0de702fa4a8408361dd42af442a556f672e9ce61a9c05d2f9b0' 
  AND token = 'HTnlliokACiPDx0SbpVJFO4DXgfIp1TIrXLFBXkIiQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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