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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22ebc001bb4f9543a82f9a497bb49693a03815c6634fc35ff9691d263ac779f' 
  AND token = 'StoNftb6Slej467MkvL9j4U+PtV2j82D08vSoBSeM1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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