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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e92d05b7e8ca641d5112b55225f9966e02fc9fdd389ab5a60cab299656be90a' 
  AND token = 'v7QXJqcaPlXIB/S44T7Jr3lLDigKss6AWffb/nkIfPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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