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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee5dbca3161698cc57601a6b620263f1e8ccdd69562a507a34884b2337d32a2f' 
  AND token = '36LMvp7M00GHOREFKrSxsRDYsHRNJj34Zvpky18M27Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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