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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e17753e68004163fa9d935802a92ac5ef914bca285ee255130f7060f4c7187' 
  AND token = 'I+EbHmuEd3uOxt8mKuhHViAPCPBXQRPx+RI6adhGC1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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