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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4710824dd54bb19f7a99761b76d5b7cf017719237361e24a62c3272b2d907ffb' 
  AND token = 'rBPxozpY2tMCXWFuIKRNe4NzsMlIZBDOi7z08y+ms38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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