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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98024c0884f1eefc6fb6a8b4a69c0730485c306696cf2080817cbeec319bf83' 
  AND token = 'x00Xy4R9vPXFVwC28jfvdHr+LrJDJPowZiTRRMJtmYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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