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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e2bd9f6c4ff5b856371773620c9437469df7e6be50054bec34bd0e48cf8284e' 
  AND token = 'rPDiWx0zR0H74Nyg2C8DKmz4G3Ne+zzNJKbqF1/OU/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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