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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1291732dc6ca86bac2189fba769ecf9ded468200e1d9a935973ee59ece877d8' 
  AND token = '9XePcAwudxV4RnQRPPrWyloVlMz7BDpB4A4DISXr/9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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