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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a258213a867270945d880aed1dec824f5651dc2e4e6cb1bf8e72ccef22b5b44' 
  AND token = 'hT45HgDLmH37DAcHBwTkElzo0yyipy1PMaU5IofdGxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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