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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6058bf969076538b0060a1cec13543d9c6933e2f6a7bf2252b4f2a172055ac' 
  AND token = 'xrrTo3wnjNL8LY9e13NN7vsb/p4o5dtdzDHBy9G6TKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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