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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ced5e80ed4c32b807306789ae20b3258411138ec0bb564715902bcf9115a68' 
  AND token = 'nM3NUVD39B78VThtzUN+MveR+yziY/awHP/22M9y+Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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