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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98575f38d649a154027743f51d9e08eedfc1f0a72e7833acbe4f731f7c7ab6fe' 
  AND token = 'HnJRE1O5K2yaiMMAnsqmm9inJNaYtRDFyyv0avURStE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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