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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb7101f829d4d43b917fb78292f1d26d908960b8d657821fce7b097813f40944' 
  AND token = 'T59V9/TIpSb37VhrwTFGTmF3skhPn7+2eS6pu/u9vzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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