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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d52bea4a0eeaebe25af786302c5570d5f0c3a5f054f5f27854ed4e238f33aef' 
  AND token = 'hYpAd4hJ2q7q0vFLQR8MElctS5O4wba6b2o6U8yxlXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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