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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a88c7760635d87c6e5d9626045f1f2a0029f2eddcf6a00d3319d3ef71889eb' 
  AND token = 'aJ2eLJkl5h2PXpw7t7Lp4emMhv/P+IH1vcM3Hk1NIyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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