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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64a33447b3d4b9377ec9fcbca56cc7c99a1e6425d4a362413a12f4db4b69a639' 
  AND token = 'A47I0e+2AMqr/ZjNDpB7K8QE+KevGtgTyG4sd946E7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00151

JSON explain

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