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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3efe6956a3be3d851707782892fd6349214b27f76e0035c4f68a1e9606cf3abe' 
  AND token = 'FvA9wy16H3bQsjS48WUFPtGofUZDCDiWkk/LkebBvrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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