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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b08d0fbc8c285d2e317f241b39d33bf9672bb0da6db148d6d42d2bed586da1' 
  AND token = 'c/srk1vjEdo1e7rmYSFn26KcgVvoJufuueMfYqzOWms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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