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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff7e4656f8b1fe8f47629dd347fe5c00da314df0ff23b829c6b9919953beb9a' 
  AND token = 'YAvr+KW55kTJNpPt5N1ZxstQcmDKMimU/ER6rrf3TlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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