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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2aec4d7aa7d50f98041f912ea4ab06577fe1555e83c997a9ac9178095e64acd' 
  AND token = '+rRk1F9+GzvpRE7h9Agrr/18bKkQQ6qTmJ2bjVTO3Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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