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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '491dadeb2ef3424be9d4bfc7a7994d8c0fb1cd56897eb48fae4bc1b4724e6029' 
  AND token = 'deByJA5Q0mWxkKy+dWl7srSACIhwc61xRGJUHo1GtzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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