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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd25f5923e683c2adb5e6a8c84f838b2ac3fe8a8da46e636da8eb78ed8a16fb1a' 
  AND token = 'GL2mZcyaFavfFlwRb7L6evbsvEMTsLTiXuGS+2OxjP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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