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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d95775d14be6b4e4d4331cc9ad61e26102e37f931864c22f8d6fdf976e8e4f' 
  AND token = 'SavLqqywP1WkFU9w6v1Xkqh4fN121nGS/Tmb7EjShRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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